Flow restrictor



T. E; COLEMAN FLOW RESTRICTOR Sept. 26, 1933.

Original Filed Oct. 26, 1929 Gttorncgs gine. 20- copending application aflow restrictor for the Patented Sept. 26, 1933 1,928,047 H FLOWRESTRICTOR v Thomas E. Coleman, Madison, Wis., assignor to Madison-KippCorporation, Madison, Wis., a

corporation of Wisconsin Original applicationioctober 26, 1929, SerialNo.

Divided and this application April 2,

1931; Serial No. 527,238

' 2 Claims. (01. 137-75) The present invention relates to flowrestrictors for fluid conduits. More particularly, the inventionpertains to a removable plug adapted to be interposed between a forcepump, or the like,

'5 and a gas engine cylinder, the plug having one or capacity, either ofWhich may be aligned with oppositely disposed orifices in a duct wherebya definite regulation of the flow of fluid through the duct is obtained.

In my copending application, Serial No. 402,-

721, filed October 26, 1929, there is illustrated a device forregulating the amount of lubricating oil delivered to the walls of aninternal combustion engine according to the speed of the en There isalso shown and described in said purpose of reducing pressure in the oilline. The present application is a division of said application SerialNo. 402,721.

In some types of internal combustion engines it is highly desirableaccurately to regulate the amount of oil delivered to the parts to belubricated or control water supplied to the combustion space of kerosenemotors. Varying engine speeds and temperature conditions, as well asother factors, necessitate adjustment of flow regulators associated withthe engine. Obviously, a pipe or duct capable of delivering a quantityof fluid suflicient to meet operating requirements under certainconditions may be too large or too small when these conditions change.

A large conduit is more desirable than a small one, because it can bethrottled to decrease the flow. While adjustable needles or gate valvesare capaisle of regulating flow in pipes, they may be easily displacedor tampered with, and cause serious interference with efficientoperation of the lubricator. They do not, furthermore, insure constantflow.

Generally speaking, once it has been determined by tests, regulations tomeet but two difone of the grooves being designed to restrict the fluidpassage to provide for a certain rate of flow under one set ofconditions, and the other groove controlling flow through the passageunder the other set of conditions. Only one of the grooves is inalignment with the passage when the plug is in place, butby removing andreversing its. position in its housing, the plug may be disposed in thefluid line to bring the other groove into regulating relation with thefluid duct.

In the drawing, a preferred form of restrictor is illustrated, and itsfunction with respect to a lubricating supply line for engines is setforth in the following description thereof. It is to be understood,however, that the restrictor is susceptible of application to othertypes of fluid conduits.

Fig. 1 is a plan view partly in section of one cylinder of amulti-cylinder internal combustion engine, showing the disposition ofthe restrictor in the oil supply line.

Fig. 2 is an elevation, partly in section, corresponding to Fig. 1.

Referring to the drawing, an oil supply pipe 11 is connected to anysuitable source of oil under pressure, preferably a pump. Pipe 12conducts oil therefrom to a plurality of cylinders, only one of which isshown at 13. A coupling 14 connected to pipe 12 and to a tapped bracket15 directs the lubricant to a passage 16 in the cylinder wall, the oilfirst passing through a groove 17 in one of the valve tappets 18. V

The valve tappets are reciprocated by cams 19, and groove 17, beingrelatively narrow, is alternately brought into and out of alignment withpassage 16 during reciprocation of the tappets. This operation isdescribed in the copending application hereinbefore referred to, andrequires no further description.

Interposed between pipes 11 and 12 is a housing 21 having a. cylindricalbore 22 therethrough adapted to accommodate a plug 23. The latter isprovided with annular grooves 24, 25, so spaced from each other and fromthe ends of the plug that only one of the grooves registers with alignedradial passages 26, 27 in the housing. These ra- UNITED sTATEsPArENTOFFI -fdial passages are tapped to receive nipples 28,

29 on the ends of pipes 11 and 12,respectively. The ends of the plug arereduced and. threaded to receive nuts 31 whereby it is firmly secured inthe housing. Suitable packing may, of course, be used to prevent leakagearound the plug.

It will be seen from the drawing that the grooves are spaced from theends of the plug a like distance. Reversal of the plug, therefore,permits either groove to be placed in register with the radial passages26, 27. The grooves differ in depth so that, depending on which of thegrooves is in alignment with the oil passages, a predetermined amount oflubricant will be delivered to pipe 12 for distribution in the enginecylinders. Furthermore, the corners 32 formed at the junction of theradial openings 26, 2'7 and the bore in housing 21 are chamfered toprevent lodging of particles of solid matter in the oil passage. I

It is obvious that the restricting device prevents over-lubrication bythrottling the oil line at high engine speeds and can be so placed as.to provide for relatively small flow in one position or a great- 2 erflow when reversed to its other position. Other plugs may be kept onhandhaving grooves differing from those on the plug in immediate use, vthereby to provide for selective throttling over a conduit; and animperforate removable'plug 1113- I ting in the bore of said member, saidplug having a pair of spaced grooves therearound, said grooves being ofdifferent depths, the plug being reversible selectively to aline eitherof said grooves with said, passages.

2. A flow restricting device for fluid pressure conduits comprising abored member having a pair of radial passages in the walls thereof anddis posed in a plane transverse to the axis of the bore of said member,said passages being spaced nearer one end of the bore than the other endthereof and forming part of said conduit; and an 'imperforate removableplug fitting in the bore of said member and. having a length equal tothat of said bore, said plug having a pair of circumferential relativelyshallow grooves of different depths, each of said grooves being spacedrespectively from the ends of said plug a distanceequal to the spacingof said passages from one end of 1 the bore.

THOMAS E. COLEMAN.

